<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>

    // 代码块
    {
      var a = 10
      a++
    }

    // 对象
    var info = {
      name:"zhangsna",
      age:10
    }
  </script>
</body>
</html>